﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _8
{
    class Program
    {
        static void Main(string[] args)
        {
           
            int i = 1;
                do
                {
                    if ( i % 2 == 0)
                    {
                        Console.WriteLine(i);
 
                    }
                    i++;
                }
                while (i < 21);
                Console.ReadKey();
        }
    }
}
